Small-sized modular type UHF radio frequency identification read-write equipment

Abstract

The invention relates to a miniature modular UHF radio frequency identification read-write equipment, which comprises the following parts: a RF launching modular, a RF receiving modular and a base band processing modular, wherein the base band modular controls RF launching modular by the control port comprised by a plurality of data wires, the RF launching modular outputs the launching signal by the RF launching port and outputs the local oscillator signal to the local oscillator receiving port of the RF receiving modular by the local launching port, the RF receiving port receives the local launching signal from the local launching receiving port, receives the label reflecting signal from the RF receiving port and outputs the demodulated band wire signal to the band wire processing modularof the read-write equipment. The invention can proceed with a distant wireless data communication with the passive radio frequency identifying label at 840-960MHz, the communication function includesthe label identification, multiple label anti-collision, writing label data, the label encryption and decrypt, the label failure.

Description

Technical field [0001] The invention relates to a miniaturized modular UHF radio frequency identification reader / writer that can perform wireless long-distance data communication with a passive RFID tag working in the 840-960MHz frequency band. Background technique [0002] RFID (Radio Frequency Identity) technology is an automatic identification technology that uses wireless radio frequency to perform non-contact two-way communication to achieve identification purposes and exchange data. [0003] The UHF band RFID system mainly includes two parts: RFID reader and RFID tag: the RFID reader modulates the baseband signal to be transmitted onto the carrier, sends it to the RFID tag, and then continuously transmits the unmodulated carrier to provide the tag with continuous operation The energy and tag reflection modulate the required carrier. The tag obtains energy from the carrier of the reader, and according to the received instruction content of the reader, the return information o...

AI Technical Summary

Problems solved by technology

The circuit structure is complex and the cost is high

[0007] Chinese patent application No. 03222830.9 discloses a wireless reading and writing device for electronic tags. The transmitting circuit of this solution is composed of a microwave digital frequency synthesizer, a microwave signal amplifier modulator and a microwave signal power amplifier. The receiving circuit is also relatively complicated and requires the use of a hybrid RF devices such as frequency converters, the cost is relatively high

This solution integrates a circulator and a zero-IF demodulation circuit, and the zero-IF demodulation circuit is also composed of several radio frequency devices, the circuit is complex, the cost is high, and it cannot be connected with the dual-antenna circuit and the dual-port single-antenna circuit.

Images